MS-SQL 数据库还原 - 只有一个文件组

Question

我目前正在为 MS-SQLBackup/Restore.

苦苦挣扎

情况：我有一个 windows-服务运行可以创建频繁（每 15 分钟）自动备份并发送到网络存储。

问题：数据库包含很多临时表，我没有兴趣备份历史数据。

因此我已将历史表移动到第二个文件组。

我需要的是只包含数据库架构和主文件组数据的备份。

我需要从那个备份中再次恢复一个功能齐全的数据库。

此外，数据库处于简单恢复模式，正如我已经提到的，我需要通过 sql 命令来完成它，并且不能使用 SSMS 编写模式/数据脚本，因为我正在从 windows-以编程方式服务。

谢谢你的想法。

Answer 1

I need to do it by sql commands and cannot use the SSMS to script the schema / data as I'm doing it from a windows-service programatically.

您可以使用 SMO API 以编程方式编写 schema/data 脚本，这是 SSMS 使用的。

Answer 2

我会考虑为目标数据库中的 replicate 数据和对象创建另一个数据库，然后为这个新数据库执行上述备份（每 15 分钟一次）。

Answer 3

这是个坏主意。如果您需要经常备份数据，您应该使用完全恢复和日志备份。
在简单恢复中，所有读写文件组都必须包含在备份中。
在完全恢复中，您提出的建议在技术上是可行的（最好的可能）。您可以备份 PRIMARY 文件组，使用 recovery 恢复它，这将使所有辅助文件组失效。然后在临时表上关闭 system_versioning 以使其可更新。

这是一个示例：

use master
drop database piecemealtest
go
/****** Object:  Database [piecemealtest]    Script Date: 12/15/2021 7:16:57 AM ******/
CREATE DATABASE [piecemealtest]
 ON  PRIMARY 
( NAME = N'piecemealtest', FILENAME = N'C:\Program Files\Microsoft SQL Server\MSSQL15.MSSQLSERVER\MSSQL\DATA\piecemealtest.mdf' , SIZE = 8192KB , MAXSIZE = UNLIMITED, FILEGROWTH = 65536KB ), 
 FILEGROUP [fg2] 
( NAME = N'fg2', FILENAME = N'C:\Program Files\Microsoft SQL Server\MSSQL15.MSSQLSERVER\MSSQL\DATA\fg2.ndf' , SIZE = 8192KB , MAXSIZE = UNLIMITED, FILEGROWTH = 65536KB )
 LOG ON 
( NAME = N'piecemealtest_log', FILENAME = N'C:\Program Files\Microsoft SQL Server\MSSQL15.MSSQLSERVER\MSSQL\DATA\piecemealtest_log.ldf' , SIZE = 8192KB , MAXSIZE = 2048GB , FILEGROWTH = 65536KB )
 
GO

ALTER DATABASE [piecemealtest] SET RECOVERY full
go
backup database piecemealtest to disk='nul'
GO

go
use piecemealtest



go
CREATE TABLE DepartmentHistory
(
    DeptID INT NOT NULL
  , DeptName VARCHAR(50) NOT NULL
  , ManagerID INT NULL
  , ParentDeptID INT NULL
  , SysStartTime DATETIME2 NOT NULL
  , SysEndTime DATETIME2 NOT NULL
) on fg2;
GO

CREATE CLUSTERED COLUMNSTORE INDEX IX_DepartmentHistory
    ON DepartmentHistory;
CREATE NONCLUSTERED INDEX IX_DepartmentHistory_ID_PERIOD_COLUMNS
    ON DepartmentHistory (SysEndTime, SysStartTime, DeptID);
GO

CREATE TABLE Department
(
    DeptID int NOT NULL PRIMARY KEY CLUSTERED
  , DeptName VARCHAR(50) NOT NULL
  , ManagerID INT NULL
  , ParentDeptID INT NULL
  , SysStartTime DATETIME2 GENERATED ALWAYS AS ROW START NOT NULL
  , SysEndTime DATETIME2 GENERATED ALWAYS AS ROW END NOT NULL
  , PERIOD FOR SYSTEM_TIME (SysStartTime,SysEndTime)
)
WITH (SYSTEM_VERSIONING = ON (HISTORY_TABLE = dbo.DepartmentHistory));



go

insert into Department(DeptID,DeptName,ManagerId,ParentDeptID)
select object_id, 'dept' + name, 0,0
from sys.objects 

update Department set managerid = 4
update Department set managerid = 5

delete from Department where deptid %10 = 3

backup database piecemealtest filegroup='primary' to disk = 'piecemeal.primary.bak'

use master 
drop database piecemealtest

restore database piecemealtest filegroup='PRIMARY' from disk= 'piecemeal.primary.bak' with partial, recovery
--Msg 3127, Level 16, State 1, Line 71
--The file 'fg2' of restored database 'piecemealtest' is being left in the defunct state because the database is using the simple recovery model and the file is marked for read-write access. Therefore, only read-only files can be recovered by piecemeal restore.
--RESTORE DATABASE ... FILE=<name> successfully processed 393 pages in 0.010 seconds (306.396 MB/sec).

use piecemealtest 

select * from Department

update Department set managerid = 8 -- fails
--Msg 8653, Level 16, State 1, Line 78
--The query processor is unable to produce a plan for the table or view 'DepartmentHistory' because the table resides in a filegroup that is not online.
go
alter table Department set (system_versioning=off)
go
update Department set managerid = 8 -- works

MS-SQL 数据库还原 - 只有一个文件组

MS-SQL Database Restore - Only one Filegroup

sql-server

database-backups